r270419 - in /trunk/gcc: ChangeLog auto-inc-dec.c

[segher@gcc.gnu.org]

Author: segher
Date: Wed Apr 17 18:49:50 2019
New Revision: 270419

URL: https://gcc.gnu.org/viewcvs?rev=270419&root=gcc&view=rev
Log:
auto-inc-dec: Set alignment properly

When auto-inc-dec creates a new mem to compute the cost of doing some
transform, it forgets to copy over the alignment of the original mem.
This gives wrong costs, for example, for rs6000 a floating point load
or store is hugely expensive if unaligned.  This patch fixes it.


	* auto-inc-dec.c (attempt_change): Set the alignment of the
	temporary memory to that of the original.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/auto-inc-dec.c